Its dependant on the brand. Some companies make their metal bodies on other brands, so one companies metal body may not work for anothers. Unfortunetly Im not an AK variant user so I dont know to many of the details. Installation difficulty is dependant on your knowledge of how of working with your AEG. If you are good at taking it apart and reassembling it, then in most cases its just a quick swap out. However in some instances there may be trouble shooting and some slight modifacation required.
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